The Galaxy Watch Ultra 2 has a massive battery that can comfortably last several days. Galaxy Watch Ultra 2 charges in 94 minutes with a 45W brickSammyGuru’s Jeff Springer tested the Galaxy Watch Ultra 2 with a 45W charging brick, and the results were much better. Samsung increased the battery capacity from 590mAh on the original Galaxy Watch Ultra to 800mAh on the Ultra 2. Users have complained about slow Galaxy Watch charging since the Watch 7 and original Watch Ultra arrived. The Galaxy Watch Ultra 2 already solves one of the biggest smartwatch problems with its three-day battery life.